Khan Academy
Khan Academy: Subtracting Two Digit Numbers Without Regrouping (Example 2)
Sal subtracts two-digit numbers (without regrouping) by thinking about tens and ones. Includes a video, transcript, and question and answer section. [2:20]
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition Sums to 20
[Free Registration/Login may be required to access all resource tools.] The video begins with an addition vocabulary overview followed by an example of adding numbers with a sum not exceeding twenty.
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition
[Free Registration/Login may be required to access all resource tools.] The video describes the two basic methods of adding numbers up to twenty. The methods shown are counting on and using tens and ones.
Math Mammoth
Math Mammoth: Add a 2 Digit Number and a 1 Digit Number Mentally: No Regrouping
Uses visual representations to model how to solve the addition of a 2-digit and a 1-digit number where there is no regrouping. [9:10]
Math Mammoth
Math Mammoth: The "Teen" Numbers: Thirteen Through Nineteen: Place Value Lesson
In this lesson, students learn that the number suffix 'teen' actually means 'ten' and how this relates to place value. Includes some work with a hundreds chart. [7:15]
Khan Academy
Khan Academy: Adding 8+7
Demonstrates how to count pieces of fruit and make a group of ten to find the sum of 8 + 7. [3:18]
Khan Academy
Khan Academy: Teens as Sums With 10
The video looks at the 1 in each teen number and thinks about what it really means as representing 10, and the pattern of the teen numbers as ten plus some other number.
Math Mammoth
Math Mammoth: Naming and Writing Two Digit Numbers
In this lesson, students learn how to assign place value to two-digit numbers, how to write numbers as groups of tens and ones, and how to match place value to sets of dots. [5:13]
Math Mammoth
Math Mammoth: Add and Subtract Whole Tens
Teaches how to add and subtract multiples of ten. [5:07]
CK-12 Foundation
Ck 12: Elem Math: Overview of Addition Sums to 100
[Free Registration/Login may be required to access all resource tools.] The video explains two, two-digit addition problems one with regrouping and the other without regrouping.
PBS
Pbs: Odd Squad: Welcome to the Break Room, Part 1
Learn about place value with the Odd Squad. Agent Oscar shows us around the Odd Squad break room, where agents hang out while they're not working on cases. A gadget can multiply any amount of food by ten!
PBS
Pbs: Odd Squad: Tracking the Number Hog
Olive and Otto learn about using zero in the ones and tens place of numbers to make numbers bigger. Will this help them track down the Number Hog?
PBS
Pbs: Odd Squad: Zeros Are Disappearing
Olive and Otto show what zeros mean in the ones, tens, and hundreds place when trying to track down the disappearing zeros.